diff --git a/CHANGELOG.md b/CHANGELOG.md
index 44ed355..2722433 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,4 +1,4 @@
-## [Unreleased]
+## リリース内容は [Releases](https://github.com/SonicGarden/sg_fargate_rails/releases) に移動しました
 
 ## [0.1.6](https://github.com/SonicGarden/sg_fargate_rails/compare/v0.1.5...v0.1.6)
 
diff --git a/lib/sg_fargate_rails/config.rb b/lib/sg_fargate_rails/config.rb
index 865b5a1..8e8df4f 100644
--- a/lib/sg_fargate_rails/config.rb
+++ b/lib/sg_fargate_rails/config.rb
@@ -1,9 +1,20 @@
 module SgFargateRails
   class Config
-    attr_accessor :proxy_ip_addresses, :paths_to_allow_access_only_from_proxy
+    attr_accessor :paths_to_allow_access_only_from_proxy
+    attr_reader :proxy_ip_addresses
 
     def initialize
       self.proxy_ip_addresses = ENV['SG_PROXY_IP_ADDRESSES']
     end
+
+    def proxy_ip_addresses=(ip_addresses)
+      @proxy_ip_addresses = Array(ip_addresses).flat_map do |ip_address_str|
+        ip_address_str.split(',').map(&:strip).reject(&:blank?).map { |ip| IPAddr.new(ip) }
+      end
+    end
+
+    def proxy_access?(ip_address)
+      @proxy_ip_addresses.any? { |proxy_ip_address| proxy_ip_address.include?(ip_address) }
+    end
   end
 end
diff --git a/lib/sg_fargate_rails/maintenance.rb b/lib/sg_fargate_rails/maintenance.rb
index ed1524f..a1ee4db 100644
--- a/lib/sg_fargate_rails/maintenance.rb
+++ b/lib/sg_fargate_rails/maintenance.rb
@@ -9,7 +9,7 @@ def initialize(app, options = {})
     end
 
     def call(env)
-      if maintenance_mode?(env) && !public_file_access?(env)
+      if maintenance_mode?(env) && !public_file_access?(env) && !proxy_access?(Rack::Request.new(env))
         headers = { 'Content-Type' => 'text/html' }
         [503, headers, File.open(maintenance_file_path)]
       else
@@ -36,5 +36,9 @@ def public_files
     def maintenance_file_path
       Rails.public_path.join('503.html')
     end
+
+    def proxy_access?(req)
+      SgFargateRails.config.proxy_access?(req.ip) || req.forwarded_for&.any? { |forwarded_for| SgFargateRails.config.proxy_access?(forwarded_for) }
+    end
   end
 end
diff --git a/lib/sg_fargate_rails/rack_attack.rb b/lib/sg_fargate_rails/rack_attack.rb
index b3d57fd..c4839b2 100644
--- a/lib/sg_fargate_rails/rack_attack.rb
+++ b/lib/sg_fargate_rails/rack_attack.rb
@@ -4,13 +4,10 @@ module SgFargateRails
   class RackAttack
     class << self
       def setup
-        proxy_ip_addresses = Array(SgFargateRails.config.proxy_ip_addresses).flat_map do |ip_address_str|
-          ip_address_str.split(',').map(&:strip).reject(&:blank?)
-        end
-        return if proxy_ip_addresses.empty?
+        return if SgFargateRails.config.proxy_ip_addresses.empty?
 
         Rack::Attack.blocklist('allow only from proxy') do |req|
-          ip_retricted_path?(req.path) && !access_from?(req, proxy_ip_addresses)
+          ip_retricted_path?(req.path) && !proxy_access?(req)
         end
       end
 
@@ -19,10 +16,8 @@ def ip_retricted_path?(path)
         rectricted_paths.any? { path.match?(/^#{_1}/) }
       end
 
-      def access_from?(req, proxy_ip_addresses)
-        proxy_ip_addresses.any? do |proxy_ip_address|
-          req.ip == proxy_ip_address || req.forwarded_for&.include?(proxy_ip_address)
-        end
+      def proxy_access?(req)
+        SgFargateRails.config.proxy_access?(req.ip) || req.forwarded_for&.any? { |forwarded_for| SgFargateRails.config.proxy_access?(forwarded_for) }
       end
     end
   end
diff --git a/lib/sg_fargate_rails/railtie.rb b/lib/sg_fargate_rails/railtie.rb
index 8cf3301..17829e6 100644
--- a/lib/sg_fargate_rails/railtie.rb
+++ b/lib/sg_fargate_rails/railtie.rb
@@ -2,6 +2,7 @@
 require 'sg_fargate_rails/healthcheck'
 require 'sg_fargate_rails/maintenance'
 require 'sg_fargate_rails/rack_attack'
+require 'sg_fargate_rails/remote_ip'
 require 'sg_fargate_rails/task_protection'
 
 module SgFargateRails
@@ -13,6 +14,7 @@ class Railtie < ::Rails::Railtie
         app.config.middleware.insert 0, SgFargateRails::AdjustCloudfrontHeaders
         app.config.middleware.insert 1, SgFargateRails::Healthcheck
         app.config.middleware.insert 2, SgFargateRails::Maintenance
+        app.config.middleware.swap ActionDispatch::RemoteIp, SgFargateRails::RemoteIp, app.config.action_dispatch.ip_spoofing_check, app.config.action_dispatch.trusted_proxies
       end
     end
   end
diff --git a/lib/sg_fargate_rails/remote_ip.rb b/lib/sg_fargate_rails/remote_ip.rb
new file mode 100644
index 0000000..e550a46
--- /dev/null
+++ b/lib/sg_fargate_rails/remote_ip.rb
@@ -0,0 +1,12 @@
+module SgFargateRails
+  # NOTE: HTTP_CLOUDFRONT_VIEWER_ADDRESSを考慮するように上書きしている
+  # SEE: https://github.com/rails/rails/blob/main/actionpack/lib/action_dispatch/middleware/remote_ip.rb
+  class RemoteIp < ActionDispatch::RemoteIp
+    def call(env)
+      req = ActionDispatch::Request.new env
+      # NOTE: HTTP_CLOUDFRONT_VIEWER_ADDRESSヘッダには127.0.0.1:3000といったIP4アドレスや2406:2d40:3090:af00:25c1:6071:b820:8e47:3000といったIP6アドレスが入っている
+      req.remote_ip = req.headers['HTTP_CLOUDFRONT_VIEWER_ADDRESS'] ? req.headers['HTTP_CLOUDFRONT_VIEWER_ADDRESS'].remove(/:\d+$/) : ActionDispatch::RemoteIp::GetIp.new(req, check_ip, proxies)
+      @app.call(req.env)
+    end
+  end
+end
diff --git a/lib/sg_fargate_rails/version.rb b/lib/sg_fargate_rails/version.rb
index f674806..a3b67fb 100644
--- a/lib/sg_fargate_rails/version.rb
+++ b/lib/sg_fargate_rails/version.rb
@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 module SgFargateRails
-  VERSION = "0.1.6"
+  VERSION = "0.1.8"
 end